Well with Bucky O Hare and Inspector Gadget already covered that saves me the trouble of posting them on my latest list of TV theme songs I enjoy, because todays theme is AMERICAN (In America) Animated program themes.
(BTW The Theme for for FHFIF is not on this list because I want to shine the spotlight on other toon themes, and besides if I wan't to talk about how awesome the Foster's theme is, I can just make a thread for that.)
Teenage Mutant Ninja Turtles: One of the most recognizable and awesomest 80's toon themes out there, the kind of song where every beat note and lyric oozes pure attitude. Turtle Power!
http://www.youtube.com/watch?v=2Zc2u5-h540
Batman Beyond: One of the very few "next gen" shows that actaully works and while it doesn't fully surpass the original Batman: The Animated Series, it comes pretty darn close. (Plus you gotta love Bruce Wayne as a cranky old man.) The rocking theme played against one of the coolest and stylelistic openings ever totally sets the mood and tone of the show perfectly.
http://www.youtube.com/watch?v=FlobF...eature=related
The Tick: Normally when you think about your average super hero theme the last thing that comes to your mind is "Scat Singing", but the Tick is far from your average superhero. And this theme song is far from average too.
http://www.youtube.com/watch?v=cUW0lj5CfuQ
Freakazoid: And speaking of Superhero Parody shows...any theme song that mentions Sigmund Freud and Floyd The Barber deserves to be on my list.
http://www.youtube.com/watch?v=9iF96...eature=related
Animaniacs: The Warner Brother love continues, with this classic theme.
Zany to the max...indeed.
http://www.youtube.com/watch?v=lga3KNKqRDc
Bump in the Night: And while we are on the subject of Rob Paulsen...yep he was in this 1994 claymation show along with fellow voice acting legend Jim Cummings. The theme song is so infectious that it gets stuck in your brain and doesn't want to let go, no matter how hard you try...hence why it's on mah list.
http://www.youtube.com/watch?v=PaQ27Hu8ix0
Spongebob Squarepants: Weather you like the show or don't, that's irrelvent. But you have to admit this is one catchy tune.
http://www.youtube.com/watch?v=uoE7IerSXZo
Commercial Break 
Now what's number eight on my list? Why it's...
G.I Joe: And know you know, and knowing is half the battle.
http://www.youtube.com/watch?v=DN034sBeF4c
(Special extended movie edition of the theme.)
Futurama: Welcome to the world of toooooooooomorrow.
http://www.youtube.com/watch?v=1cYgqSdjMTk
The Powerpuff Girls: You know that show that one guy did, before he went off made that other show that we all seem to like and stuff. Yeah it had pretty good theme music too.
http://www.youtube.com/watch?v=gpjVR...eature=related